I've stuttered my whole life and I now do stand up comedy. When I was in school I hated giving presentations, but through comedy I have learned that the best way to help with the nerves is to remind yourself that none of your listeners are above you. It's okay to stutter and that's what I think so many of us forget. Also, definitely preface. Let them know upfront that you stutter, but say it in a way that lets your listeners know you are comfortable with your stutter. Hope this helps some.